New EYEMAGIC Scanners EMS7000

[norty303]

When I project a logo for a client on a wall, I don't go and measure the angles, I look at the logo and see how it looks, don't need any maths to see if a logo looks good or not

You are comparing apples with oranges.

The 'spec' uses scan angle as it is a constant. Distance to target doesn't matter. If we were to say 'X size at Y metres' some here might say they can't get a room with enough distance for X metres to test.
There are enough online calculators for this to be very simply calculated, so you don't even need to be a trig wizard, just be aware of its existence.

Given the math involved in show emmission evaluation, a bit of trig should be a drop in the ocean for a laser show company.

Nobody is saying you should use this to set up your show, that is something entirely different.

[DZ]

I disagree, I think the ILDA test pattern is as relevant today as it was back in the day. It is a standard by which all scanners can be tuned to so that a frame displayed on my projector will look almost exactly the same on your projector. Look at it this way, imagine being sold a car and the dealer claims the car will go 150mph (ok, 241K/Hr for the rest of the world!). What ever you do, don't look at the speedometer to determine how fast your going, just look out the window, if it looks like your going 150mph, then you must actually be going 150mph.

Regarding the EMS scanners. I have nothing against EMS, I owned a set of EMS3080's back in the day and they performed flawlessly. At FLEM, I was tasked with setting up the EMS7000 scanners. They are a very nice scanner setup, the amps were very small and appeared well made. I think the only beef I has was the fact that the slots on the amp heat sink did not accommodate a 1/4-20 bolt, so I had to rig it up a bit to make sure we had good heat dissipation to the top of flecom's projector, which conveniently had 1/4-20 threads on 1 inch centers. From there we fiber fed an unblanked beam from a reliant to the scan head. Buffo measured the distance between the scan head and the screen and at various points in time he was asked to measure the image width and height to calculate the scan angle. I can remember that right out of the box tuning was not near 60K and after some retuning to 60K the image size was less than the required 8 degrees.

Who knows, perhaps there is a defect with this set, it happens, defective hardware puts food on my table every day. I would like to try to and convince EyeMagic to send another set to buffo for an independant review. EyeMagic, please understand that buffo has reviewed many scanner sets here on this forum and is a very well trusted member. And at the end of the review he's even offered to ship them back. If the set Bill had was indeed defective, then what's there to lose on this?

[Solarfire]

Hey DZ, as far as the ILDA frame is concerned, let’s just agree to disagree on that one.
As to the EMS7000 scanner test at the FLEM I have only one question. Did the ILDA test frame at the FLEM look anything near the picture I posted; I find it amazing that not even one picture of these tests made it to this thread, or any other thread for that matter.
All that aside, looking at the picture I posted and assuming that I’m not an idiot and the scanners are running @ 60kpps @ =>10°, keeping in mind that no adjustments have bin made. How far off do you think that these are form performing the 60k they should be performing? I don’t see so much missing here that couldn’t be improved via some tweaking. We’ll see later.

[p1t8ull]

DZ, are you 100% happy that the PSU for the EMS amps in flecoms projector was supplying the required juice?

[DZ]

Hey DZ, as far as the ILDA frame is concerned, let’s just agree to disagree on that one.

Fair enough!

As to the EMS7000 scanner test at the FLEM I have only one question. Did the ILDA test frame at the FLEM look anything near the picture I posted;

No, if I remember correctly it accurately displayed the ILDA test pattern at around half the required scan angle. The photo that you posted shows that the ILDA test pattern is not being accurately displayed, though I also see that blanking shift is off so perhaps we are seeing a part of the circle that is suppose to be blanked. The best thing to do is to convert all the blank points to visible points so we can also see what's going on "behind the scenes".

I find it amazing that not even one picture of these tests made it to this thread, or any other thread for that matter.

I didn't take any photo's, but then again I have nothing to prove here. Being a casual observer, I can only tell you what I saw. If a picture is required then again, I'd like to see a set go to buffo for an evaluation.

All that aside, looking at the picture I posted and assuming that I’m not an idiot and the scanners are running @ 60kpps @ =>10°, keeping in mind that no adjustments have bin made.

If you made no adjustments and the scanners that Bill had were not faulty and not adjusted, then that would indicate inconsistant tuning from the manufacturer. I think if anything this thread has brought about some great discussions on the interal workings of scanners, the ilda test pattern and tuning. It's been a great read except for the off-topic drama. Going back to your pic, just from a high level view I would again say that they are not accurately displaying the pattern at 60K. If you could repost another pic either with a laser that is not blanked at all, or recolor each point to visible, I think that would help.

DZ, are you 100% happy that the PSU for the EMS amps in flecoms projector was supplying the required juice?

Hi p1t8ull! That's a great question! The power supply used was from flecom, so I don't know what the specs were, hopefully he'll chime in with the specs. I know that they are used to drive his EMS4000 scanners. What is the requirement for the EMS7000's?

[mixedgas]

If you would like, since my present contract burns up a 50 hour week, and prevents me from doing much other then designing diode driver hardware, I'll be glad to test the EMS or other sets.

I own older Cambridge 6800s, GSI G120s, DTs and EMS 3080s, so very little "BIAS" on my part except I love this industry and hate poor quality galvos..

Patterns can come from LSX using RIYA, Ether-Dream or a QM32, which is the "Gold Standard" ILDA pattern generator.

A 200 Mhz DSO and access to a whole graduate and undergraduate electrical engineering lab means I've got the gear access.


All I ask is the pairs I test are NOT mine, and are new boards/galvos from the factory.

TEST psu will be ANALOG non-switching 24V psus made with massive transformers and filter banks.

Tests will look at pulse widths, small and large jump times, ringing. and the ILDA patterns, which are somewhat subjective.
Tests can be witnessed by a Electrical Engineer with a Masters, with no dog in this fight, or a PhD Physicist.

I make "error bars" on graphs for a living, so to speak...

I'm well equipped for this.....

Steve

[dsli_jon]

hey P'fessor -

..or a QM32, which is the "Gold Standard" ILDA pattern generator

QM32? Are you saying, vs the QM2K? Curious why you'd say-that, if-so..

We can talk about our set coming to you, possibly, once I can get them back from someone they are on 'loan' to... They are still 'virgins', and must return that way, so... sorry, no 'Saturday Night Specials' for you and the 7Ks.. ..at least not ours...

ttys..
j

[Solarfire]

Ok.. a little update. Well after tweaking the output of the ILDA frame @60kpps @ 10° my opinion of the ILDA frame has been confirmed. The original tuning of the scanners was better than when strictly tuned to the ILDA frame. I watched a couple of shows before and after tweaking and all I can say is f**k the ILDA frame, I can get better overall (graphic) results without. Only the user adjustable trimmers for gain and damping were adjusted. Here the results of the 2 scan heads and the picture of one of the scanners with the original tuning. In my opinion this qualifies as a 60k scanner.

Tomorrow I’ll do some more testing with the ILDA frame at different scan angles and speeds.

Ah.. can someone post the results of a CT6215 @60kpps @ 10°?

[DZ]

Tomorrow I’ll do some more testing with the ILDA frame at different scan angles and speeds.

Would you mind using the attached frame file when doing more testing tomorrow? It's basically the ilda test frame with no blanking.

unblanked ILDA.ild

[p1t8ull]

Hi DZ, the EMS7k's require 20-30V and 60W per rail minimum